The Cleveland County Sheriff's Office in Oklahoma experienced a ransomware attack targeting segments of its IT infrastructure, though the responsible threat actor remains unidentified. While the intrusion disrupted internal systems, officials confirmed that public safety services and 911 emergency response operations remained unaffected. The office is actively assessing the full scope of the breach and has committed to providing updates to prevent misinformation and rumors. The attack forced a shift to alternative procedures, though no details were disclosed regarding data exfiltration, financial demands, or the extent of system encryption. Recovery efforts are underway, but the incident highlights vulnerabilities in critical law enforcement infrastructure, raising concerns about potential long-term operational disruptions or secondary impacts on administrative functions.
Source: https://www.scworld.com/brief/oklahoma-massachusetts-hit-by-separate-cyber-incidents
Cleveland County Sheriff's Office cybersecurity rating report: https://www.rankiteo.com/company/cleveland-county-sheriffs-office
"id": "CLE2702727112525",
"linkid": "cleveland-county-sheriffs-office",
"type": "Ransomware",
"date": "11/2025",
"severity": "75",
"impact": "2",
"explanation": "Attack limited on finance or reputation"{'affected_entities': [{'industry': 'public safety',
'location': 'Oklahoma, USA',
'name': "Cleveland County Sheriff's Office",
'type': 'law enforcement'},
{'industry': 'public administration',
'location': 'Massachusetts, USA',
'name': 'City of Attleboro',
'type': 'local government'}],
'description': "Oklahoma's Cleveland County Sheriff's Office and "
"Massachusetts' City of Attleboro experienced separate "
"cyberattacks last week. Cleveland County Sheriff's Office "
'faced a ransomware intrusion affecting segments of its IT '
"system, while Attleboro's local government and police "
'department were disrupted, impacting email systems and phone '
'lines. Both entities are assessing the incidents and working '
'on recovery.',
'impact': {'downtime': [{'details': 'partial IT system disruption (public '
'safety services and 911 unaffected)',
'entity': "Cleveland County Sheriff's Office"},
{'details': 'local government and police department '
'operations disrupted; paper-based '
'procedures in use at City Hall',
'entity': 'City of Attleboro'}],
'operational_impact': [{'details': 'assessment ongoing; proactive '
'communication to prevent '
'rumors',
'entity': "Cleveland County Sheriff's "
'Office'},
{'details': 'restoration efforts in '
'progress; regular updates '
'provided',
'entity': 'City of Attleboro'}],
'systems_affected': [{'entity': "Cleveland County Sheriff's Office",
'systems': ['segments of IT system']},
{'entity': 'City of Attleboro',
'systems': ['email systems',
'phone lines']}]},
'investigation_status': [{'entity': "Cleveland County Sheriff's Office",
'status': 'ongoing assessment'},
{'entity': 'City of Attleboro',
'status': 'restoration in progress'}],
'references': [{'source': 'The Record (by Recorded Future)'}],
'response': {'communication_strategy': [{'details': 'proactive sharing to '
'ensure accuracy and '
'prevent rumors',
'entity': 'Cleveland County '
"Sheriff's Office"},
{'details': 'regular updates by Mayor '
'Cathleen DeSimone',
'entity': 'City of Attleboro'}],
'incident_response_plan_activated': [{'details': 'assessing full '
'scope; '
'proactive '
'communication',
'entity': 'Cleveland '
'County '
"Sheriff's "
'Office'},
{'details': 'direct steps '
'taken; regular '
'updates '
'provided',
'entity': 'City of '
'Attleboro'}],
'recovery_measures': [{'details': 'ongoing efforts to restore '
'affected systems',
'entity': 'City of Attleboro'}],
'remediation_measures': [{'details': 'paper-based procedures '
'implemented at City Hall',
'entity': 'City of Attleboro'}]},
'threat_actor': 'unknown',
'title': "Cyberattacks Disrupt Cleveland County Sheriff's Office and City of "
'Attleboro',
'type': ['ransomware', 'cyberattack']}